Resideo - Honeywell Home RA89A1074 Hydronic Switching Relay

The RA89A1074 Hydronic Switching Relay from Resideo / Honeywell Home delivers reliable control for radiant heating systems. This intermediate SPST relay is designed for hydronic control, featuring a 24V AC coil and an integral transformer to simplify wiring and installation.

Engineered for 120V and 240V circuits, it carries robust full-load ratings and resistive performance, making it suitable for boilers, valves, and zone controllers. The compact enclosure measures 4-1/4" W x 2-5/16" D x 5-1/4" H and is UL and CSA listed for safe operation.

Key specifications and features include

• Coil and control: 24V AC coil; 2-wire control circuit; 5 Watt input at 120V AC
• Electrical ratings: 10.2 A at 120V AC and 5.1 A at 240V AC (full load); 61.2 A at 120V AC and 30.6 A at 240V AC (locked rotor); 10 A at 120V AC and 6 A at 240V AC (resistive)
• Enclosure: Integral transformer included for simplified installation
• Application: Hydronic control for boilers, valves, and zone controls
• Standards: UL and CSA listed; ambient temperature rating 115°F at 60 Hz and 105°F at 50 Hz
• Physical specs: 4-1/4" W x 2-5/16" D x 5-1/4" H